id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
147	Console lockup	charles.unix.pro@…	Eric Swenson	"With the multi-threaded dps8, the operator console occasionally locks up. Waiting 30 seconds allows the console to timeout and become accessible again.

Olin S. says:

""This behaviour is not unprecedented--console 
hangs are something we had occasionally and 
always had the devil's time diagnosing.

My guess is that it's due to an interrupt being 
lost or mis-handled, which might be a side-effect of connect misbehaviour.

I think it's unlikely to be a problem in the 
ipc_$block path and associated mechanisms--an 
interrupt should arrive and be processed pretty 
much immediately to send an event to an event channel.

Typically, what we'd do is put in some syserr 
calls to trace relevant events in ring zero, and 
look for unusual delays. In the emulator, you 
have more opportunities since you can log events 
internal to the emulated devices as well. The ocdcm code is not simple.

Another possibility is that something else is 
keeping the Initializer process busy (or 
waiting), and that you're seeing the results as 
an effect on console responsiveness, even though 
the actual problem is unrelated. This would be even more annoying to diagnose.""
"	defect	closed	minor	MR12.8	Hardcore	MR12.6f	fixed	console opcon lockup